2019 May 21

# Special groups theory seminar: Abdalrazzaq R A Zalloum (Suny Buffalo) "Regular languages for hyperbolic-like geodesics".

4:00pm to 5:00pm

## Location:

Ross 63
Combinatorial group theory began with Dehn's study of surface groups, where he used arguments from hyperbolic geometry to solve the word/conjugacy problems. In 1984, Cannon generalized those ideas to all "hyperbolic groups", where he was able to give a solution to the word/conjugacy problem, and to show that their growth function satisfies a finite linear recursion. The key observation that led to his discoveries is that the global geometry of a hyperbolic group is determined locally: first, one discovers the local picture of G, then the recursive structure
2019 May 21

# Special groups theory seminar: Abdalrazzaq R A Zalloum (Suny Buffalo) "Regular languages for hyperbolic-like geodesics".

4:00pm to 5:00pm

## Location:

Ross 63
Combinatorial group theory began with Dehn's study of surface groups, where he used arguments from hyperbolic geometry to solve the word/conjugacy problems. In 1984, Cannon generalized those ideas to all "hyperbolic groups", where he was able to give a solution to the word/conjugacy problem, and to show that their growth function satisfies a finite linear recursion. The key observation that led to his discoveries is that the global geometry of a hyperbolic group is determined locally: first, one discovers the local picture of G, then the recursive structure
2019 May 28

# Dynamics Lunch: Uri Gabor

12:00pm to 1:00pm

Following the paper “ Preperiodic points and unlikely intersection” by Baker and DeMarco.
2019 Jun 18

# Dynamics Lunch: Michael Chapman

12:00pm to 1:00pm

Following the paper “ Preperiodic points and unlikely intersection” by Baker and DeMarco.
2019 May 27

# NT & AG Lunch: Michael Temkin "The explicit local class field theory"

1:00pm to 2:00pm

## Location:

Faculty lounge, Math building
I'll tell a couple of anecdotes related to imaginary quadratic fields (e.g. primes in the sequence n^2+n+41), and then open a new story -- local CFT and the explicit construction of K^ab due to Lubin-Tate.
2019 Jun 04

# Dynamics Lunch: Yotam Smilansky

12:00pm to 1:00pm

Following the paper “ Preperiodic points and unlikely intersection” by Baker and DeMarco.
2019 May 21

# T&G: David Nadler (Berkeley), What kind of an invariant are microlocal sheaves?

11:00am to 12:30pm

## Location:

Room 07, Levi Building, Jerusalem, Israel
I will give an introduction to sheaves and microlocal sheaves, as pioneered by Kashiwara-Schapira. The goal will be to explain recent work with Shende establishing that microlocal sheaves on a Weinstein manifold are a symplectic invariant.
2019 Jun 11

2:00pm to 3:00pm

2019 May 13

2:00pm to 3:00pm

Ross 63
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2019 May 14

# Dynamics Lunch: Hongming Nie "Preperiodic points of unicritial polynomials”.

12:00pm to 1:00pm

Following the paper “ Preperiodic points and unlikely intersection” by Baker and DeMarco.
2019 May 13

# NT & AG Lunch: Michael Temkin "Elliptic curves with complex multiplication, II"

1:00pm to 2:00pm

## Location:

Faculty lounge, Math building
2019 May 13

# NT & AG Seminar: "A dream desingularization algorithm", Michael Temkin (HU)

2:30pm to 4:00pm

## Location:

Ross 70
Abstract: Any birational geometer would agree that the best algorithm for resolution of singularities should run by defining a simple invariant of the singularity and iteratively blowing up its maximality locus. The only problem is that already the famous example of Whitney umbrella shows that this is impossible, and all methods following Hironaka had to use some history and resulted in more complicated algorithms. Nevertheless, in a recent work with Abramovich and Wlodarczyk we did construct such an algorithm, and an independent description of a similar
2019 May 28

# Toru Sera (Kyoto), Multidimensional arcsine law for intermittent interval maps

2:00pm to 3:00pm

Abstract: Paul L\'evy's classical arcsine law states that the occupation time ratio of one-dimensional Brownian motion for the positive side is arcsine-distributed. The arcsine law has been generalized to a variety of classes of stochastic processes and dynamical systems.
2019 Jun 10

# NT & AG Seminar - Dan Editin

1:00pm to 2:00pm

TBA - Notice special time
2019 May 07

# Anatoly Vershik (St. Petersburg) Соmbinatorial (locally finite) еncoding of the Bernoulli processes with infinite entropy.

2:00pm to 3:00pm

Abstract. The realization of m.p automorphisms as transfer on the space of the paths on the graded graphs allows to use new kind of encoding of one-sided Bernoulli shift. I will start with simple example how to realize Bernoulli shift in the locally finite space (graph) $\prod_n {1,2,\dots n}$ (triangle compact.) Much more complicated example connected to old papers by S.Kerov-Vershik and recent by Romik-Sniady in which one-sided Bernoulli shift is realized as Schutzenberger transfer on the space of infinite Young tableaux with Plancherel Measure. These examples open series of